Both come from the research started by Stafford Beer in Chile and they are not alone: People as Terry Winograd or Fernando Flores are in the same package and all of them give powerful reasons against the so-called GOFAI (Good-Old-Fashioned-Artificial-Intelligence).
Maturana and Varela are not the first but, for sure, they are among the brightest.Excellent! This book, if read carefully, will change the way that you look at the world. It is powerful and insightful.